If your car fails its MOT, you’ll need at least a partial retest after the repair. After more than 40 years in the motor trade, I’ve created this guide to explain how MOT retests work in the UK, when you can get one for free, the time limits you need to know and what to expect so you can get back on the road as soon as possible.
Last updated: 13th October, 2025
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Once per year, every car older than three years needs to pass an MOT test in order to be deemed roadworthy. When you pass, you'll receive an MOT certificate, good for one year from the test date.
The certificate is a legal requirement for driving on public roads in the UK. It signifies that your vehicle meets the minimum safety and environmental standards set by the government.
If your car fails its MOT, you'll receive a list of necessary repairs or replacements, which you have to carry out before your vehicle can pass.
Once the garage makes these repairs, you'll have your car tested again to verify it now meets the required standards.
For your first MOT test, the maximum cost is £54.85 for a car and £29.65 for a standard motorcycle. As for MOT retests, there are two main scenarios: free and paid retests.
That's why it's so important to read reviews on MOT garages before choosing one. You might find the garage overcharges for repairs, leaving you no choice but to find another garage and then paying the entire MOT test fee over again.
In the UK, when your vehicle fails its MOT, you will need to undergo either a partial retest or a full retest, depending on how you handle the repairs and the timing of the retest.
A partial retest covers only the specific faults that caused the vehicle to fail the initial MOT. It is generally quicker and less expensive than a full retest. You can qualify for a partial retest under the following conditions:
A full retest involves re-examining the entire vehicle, not just the previously failed items. This will likely be required in the following scenarios:
Choosing between a partial and a full retest depends on the extent of the repairs needed, your convenience, and the specific rules of the MOT centre you wind up going with.
You have specific timeframes within which you must schedule a retest depending on whether you opt for a partial or full retest.
If you leave your vehicle at the same test centre for repairs, you can schedule a partial retest immediately after the repairs are completed. To qualify for a free or discounted partial retest, it must be done within 10 working days from the date of the initial failed test.
If you take your vehicle to a different garage for repairs, you must return to the original test centre within 10 working days for a partial retest. If you bring it back within one working day and the faults are minor, the retest may be free.
If you delay the retest beyond 10 working days or take the vehicle to a different test centre, you will need a full retest, which requires paying the full MOT fee again. The full retest must be conducted within 21 days of the original failed test.
If your vehicle fails its MOT, the most straightforward option is to leave it at the same MOT test centre for repairs and then have it retested there. We recommend doing this because it's low-effort and potentially free.
You can also take your vehicle to a different garage for repairs and then bring it back to the original MOT test centre for a retest, though that can be tedious. In this case, you would typically be eligible for a partial retest, though it might incur a fee of up to 50% of the original MOT cost.
If you decide to take the vehicle to a different test centre for both the repairs and retest, you will likely need to undergo a full MOT test again, and you'll be charged the full fee for this service.
Only a licensed MOT garage can carry out MOT retests. You cannot take the vehicle to an independent mechanic or conduct the retest yourself.
The garage must be certified by the UK government to carry out MOT tests, and it should display a blue sign with three triangles outside that says 'Vehicle Testing Station'.
The time needed for your retest depends on whether you need a full or partial retest. If you need a full retest, it will take the same amount of time as a standard MOT test (45-60 minutes). If you're able to get a partial retest, it'll be much faster.
Certain types of repairs qualify for a free MOT retest if the vehicle is returned to the original test centre by the end of the next working day (or within 10 working days for the same garage). The repairs must address specific minor issues, and the retest will only cover these particular faults.
Here are examples of repairs that qualify for a free retest:
For more extensive types of repairs (e.g., for major or dangerous defects), if the vehicle is returned within 10 working days, a partial retest fee may be charged, usually up to 50% of the original MOT fee.
When you go in for an MOT test, there are a few things you need to take:
Your MOT history is all digitised, and your test centre will be able to pull your previous test record. You don't need to carry a paper copy of your MOT certificate with you.
Yes, you can drive your car before your MOT retest under specific conditions:
Remember that if your vehicle fails the MOT due to a "dangerous" fault, it immediately becomes illegal to drive it on the road until you have it repaired. This also means you’ll have to have the test at your MOT testing garage as well, or have it transported to another garage without driving it.
If your vehicle fails the MOT retest, you will need to address the issues that caused the failure before you can legally drive it again.
Here's the sequence of events you can expect:
Pro tip: If you’re just looking to scrap your car, know that we buy MOT failure vehicles of any make, in any condition. Save yourself the time and get an instant quote from us instead.
If you miss the retest within the 10-working-day window, you will need to book a new MOT test, and you may lose the opportunity for a discounted or free partial retest. Missing the retest may mean paying the full MOT test fee again, as you will need to start the process over from scratch.
If your vehicle has failed its initial MOT and you miss the retest, your car may not be legally drivable if your previous MOT certificate has expired. Driving without a valid MOT certificate can result in fines up to £1,000, and it could invalidate your insurance.
It’s important that you rebook the MOT as soon as possible. If your vehicle is not roadworthy, you should avoid driving it altogether until the issues are resolved and a new MOT is secured.
Once you fix the issues that caused you to fail, you shouldn't have to worry too much about passing. That's why it's best to do your retest and repairs at the same MOT garage, they're already familiar with your car and what caused it to fail, so they can fix it right away and send you off.
We strongly recommend performing regular maintenance and vehicle checks to avoid the need for a retest. Proper care can easily prevent most of the typical issues that cause MOT failures.
Here are some tips to ensure your car passes its MOT:
And when major issues come up, address them right away. Many of the things that could cause you to fail your MOT with a major defect are noticeable. By fixing them early, you can get the work done on your own time and eliminate the hassle of an MOT retest in the first place.
Before your MOT, ensure you pass by going through our complete MOT checklist and guide.
By keeping up with regular maintenance, you can save time and money by avoiding MOT failures and retests. Plus, you'll be ensuring the safety of yourself and others on the road.
If you do need a retest, don't stress. It's common; millions fail each year. And it can be easily remedied.
Just make sure to address the issues promptly and get your vehicle back on the road as soon as possible. And always remember to book your MOT in advance, so you have plenty of time for any necessary repairs before your certificate expires. Check your MOT status now using our free MOT checker tool.
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